Respiratory System: Gas Transport

Hemoglobin is 100% saturated when how many molecules of O2 are bound to it?

1

4

98

6

After oxygen is unloaded from hemoglobin at the tissues, hemoglobin is called:

oxyhemoglobin.

deoxyhemoglobin.

From the oxygen-hemoglobin dissociation curve, hemoglobin is 98% saturated when the partial pressure of oxygen is 100%. Is this saturation level in the lungs or in the tissues?

In the tissues

In the lungs

At high altitudes, the partial pressure of O2 can decrease 20 mm Hg in the lungs. How does high altitude affect the saturation of hemoglobin?

There is a small increase in the saturation of hemoglobin.

There is a large increase in the saturation of hemoglobin.

There is a large decrease in the saturation of hemoglobin.

There is a small decrease in the saturation of hemoglobin.

During exercise the partial pressure of O2 in the tissues can decrease 20%. How does exercise affect the saturation of hemoglobin?

There is a large decrease in the saturation of hemoglobin.

There is a small decrease in the saturation of hemoglobin.

There is a large increase in the saturation of hemoglobin.

There is a small increase in the saturation of hemoglobin.

Would an increase or decrease in temperature, PCO2, or BPG decrease hemoglobin's affinity for oxygen?

An increase in any of these factors would decrease hemoglobin's affinity for oxygen, releasing more oxygen to the tissues.

A decrease in any of these factors would decrease hemoglobin's affinity for oxygen, releasing more oxygen to the tissues.

A decrease in body temperature would shift the oxygen-hemoglobin dissociation curve in which direction?

Right (more O2 would be released to the tissues)

Left (less O2 would be released to the tissues)

How is the majority of CO2 transported in the blood?

dissolved in the plasma

bound to the globin portion of hemoglobin

as bicarbonate ions

As bicarbonate ions move out of the red blood cell, what ions move in?

Hydrogen

Sodium

Potassium

Chloride

In the lungs, O2 loading facilitates CO2 unloading from hemoglobin. This is known as the _________ effect.

Bohr

Haldane

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